Adsorption of guar gum and CMC on pyrite

Bicak, O., Ekmekci, Z., Bradshaw, D. J. and Harris, P. J. (2007). Adsorption of guar gum and CMC on pyrite. In: D. Bradshaw, Minerals Engineering: Reagents 2006 Conference. Reagents 2006 Conference, Cape Town, South Africa, (996-1002). 1 November 2006.


Author Bicak, O.
Ekmekci, Z.
Bradshaw, D. J.
Harris, P. J.
Title of paper Adsorption of guar gum and CMC on pyrite
Conference name Reagents 2006 Conference
Conference location Cape Town, South Africa
Conference dates 1 November 2006
Proceedings title Minerals Engineering: Reagents 2006 Conference   Check publisher's open access policy
Journal name Minerals Engineering   Check publisher's open access policy
Place of Publication Oxford, Eng
Publisher Pergamon Press; Elsevier
Publication Year 2007
Sub-type Fully published paper
DOI 10.1016/j.mineng.2007.03.002
ISSN 0892-6875
Editor D. Bradshaw
Volume 20
Issue 10
Start page 996
End page 1002
Total pages 7
Language eng
Abstract/Summary The depression of pyrite in sulfide flotation by two types of polysaccharides, CMC and guar, was investigated using micro-flotation tests, zeta potential measurements and adsorption tests. Environmentally and from an occupational safety standpoint – this would be a better processing option than cyanide. The range of variables tested included molecular weight of guar, degree of substitution of CMC,pH and the concentration of calcium ions in the flotation process water. The guar gums depressed pyrite considerably even at low dosages. An optimum dosage of 10 ppm was recommended. The CMC’s were not as effective as the guar gums, and required much higher dosages to achieve pyrite depression. Within the range of CMC’s tested, lower degree of substitution was more effective than high degree of substitution. This was presumably due to lower electrostatic repulsion between the negatively charged CMC and pyrite. When calcium ions were introduced with CMC’s, the adsorption of the CMC was considerably enhanced. No such effect was observed for guar gums.Both CMC and guar gums demonstrated Langmuirian behavior in their adsorption isotherms. Two different adsorption mechanisms were displayed. The guar gum adsorption was attributed to hydrogen bonding and Bronsted acid–base interaction. The CMC was considered to occur through electrostatic interaction in the presence of calcium ions, and Bronsted acid–base interaction depending on pH.
Subjects 290701 Mining Engineering
Keyword Sulphate ores
Flotation depressents
Adsorption
Polysaccharides
Q-Index Code E1

 
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